Attachment for phonographs and like machines.



J. D. BARTEIL ATTACHMENT FOR PHONOGRAPHS AND LIKE MACHINES.

APPLICATION FILED JUNE 29. 1911.

Patented App. 16, 1912.

UNITED STATES PATENT oFFIoE.

JOHN D. BARTER, OF nnwgonx, n. rearssmn'on 0F own- ALF To MARY BARTn-n,

. OF NEW YORK, N. Y.

ATTACHMENT FOR rnonodnei ns mm mkii 'iaacnmns.

s ecif cation of Letters Patent.

Patented Apr. 116, 1,912.

Application filed June '29, i 1 Serial in. 636,006.

My invention relates to an attachment adapted to be used in connectionwith-a pho' nograph or other similar sound reproducing machine and hasfor its object to produce an instrument that will amplify the soundsreproduced from the record and which shall accomplish this withoutimpairing the timbre and tone qualities of the record being translated,a defect that is common to amplifying horns such as are usually employedin connection with sound reproducing machines; and which often renderstheir use, especially in parlors and small apartments, objec'tionablc.

The invention will be hereinafter described and is illustrated in itspreferredform in the accompanying drawings, where n I v Figure 1 is aside view of an instrument embodying my invention applied to a soundreproducing or talking machine of a welllrnown type. Fig. 2 is a rearelevation of the attachment. Fig. 3 is a front elevation of the same,the front. wall. of the casing being removed. Fig. 4 is a similar viewto Fig. 3 with the sounding boa rd removed and parts being iii-section.Fig. 5 is a longitudinalsectional view through the com )lete attachment.Fig. (l is an elevatipn o the soundin oard detached, Fig. 7 15 an edgeview 0 the sounding-board drawn to a larger scale. 'Figs. 8 and-fl aredetached views of the support for the attachment.

In the accompanying drawings A designates the casing of a talkingmachine, pro

vided with mechanism for supporting and ally employed with talkingmachines. It supported from arocking or swivel s'upwhich has anadjustable connection Iwith the casing of the instrument E. Thisincasing in which is mounted a sounding board, and a tubular stem orsound-conducting tube uniting the. casing with the sound box D. Thistubular stem is desig nated 2 and is preferably straight, with an offset3 atits end, adapting it to 'be readily attached to the tubular studwith which the sound box D is provided. A packing 4 of rubber. felt, orother suitable material, is provided at the end of the offset 3 for thebetter connection with the stem of the sound which is preferably ashallow box approkimately circular in outline and closed by end walls (3and 7, one of which is preferably removable. The opening from the steminto the casing is preferably controlled by a gate .01 valve 8, adaptedto be operated from the outside. a handle 9. By means of this valve thevolume of the sound entering the casing from the sound box D may beregulate'd. \Viihin the casingfi there is mounted a souhding board 10,which I meter to form of thin and renosantwood. It seated upon a narrowledge or seat 11 formed in or carried by the rim 12 of the casing-and isheld in place bv a clamping ring 13. I have found that the volume of thetones reproduced by the sounding board is increased if-the latter hasformed in it a number of perforations 14, and that the best effects a'reproduced if these are located in a group situated between the center ofthe board and its periphery. I have also discovered that the clearnessof the tones reproduced and their beauty is increased if i there isattached to one face of the sound ing board. surrounding or coveriiigthe apertures 14.;1cell 15. which is preferably formed of thin wood likethe sounding board, and consisting of a small perforated plate 16,supported at a short distance from. and substantially parallel with. thesounding board, by a wooden rim 1? which is also preferably perforated,as indicated at. 18.

In one wall of the sound casing 5, which itself is formed of rigid,resonant material,

is preferablyport JF mounted in a bracket G, extendingfrom' the casingA, by means of an arm H,

strument consists essentially of a hollow bov. The stem 2 opens into ahollow casing,

there is an opening 19 opposite the cell 15, and approximately the sizeof the outline of the latter.

proved if the hollow stem be open at both ends, at one end into thecasing carr ing the sounding board, as described, an at the other endinto the open air a's indicated at 20. This latter opening need not belarge, but is important. The stem when thus con structed CODSillZlltQSan open-sounding tube communicating with the tone-producing devicesatone endand .with the sounding board chamber at the other. 7

hen an instrument such as I have de scribed is applied to asound-reproducing or talking machine, as indicated in Fig. 1. thereproduced sounds are amplified,,'but not to an undesirable degree, andare found to have, to a remarkable extent-,- the't imbre of the originalsound recorded. The sounds are very clearly reproduced and the harsh,grating and metallic soundsyso often incident to the use of talkingmachines are reduced to a minimum, or even entirely eliminated.

\Vhat I claim is: a

1. The combination with the sound box of a sound reproducing machine, ofa casing containing 5. perforated sounding board and a tubularconnection between the casing and the sound box open at one end into thecasiug and at the other into the atmosphere.

2. The combination with the sound box of a talking machine, of a casinginclosing a perforated sounding board, a cell carried by the board andinclosing the perforations, and a tubular connection between the casingand the sound box, and open at one end into the casing and at the otherend into the atmosphere.

3. The combination with the sound box of a talking machine, of a casinginclosing a sounding board having a series of openings adjacent oneedge, and a. cell carried by the board and inclosing the openingstherein.

4-. The combination with the sound box of a talking machine, of a casincontaining a sounding board in which are armed a number of perforations,arranged in a group 10- rated between the center of the board and itsperiphery, a tubular connection between the sound box and the casing,and a cell attached to the sounding board and inclosing the perforatedportion thereof.

5. The combination with the sound box of a talking machine, of a casingcontaining a perforated sounding board, a. tubular conmg, and a cellattached to the sounding.

board and inclosing the perforated portion thereof.

6. The combination with the sound box of a talking machine, of a casincontaining a sounding board in which are irmed enumber'of perforations,arranged in a group located between the center of the board and itsperiphery, a tubular connection between the sound box and the casing,and a cell attached to the sounding board and covering. the perforationstherein. 7 7. The combination with the sound box of a sound reproducingmachine, ofa casing of rigid resonant material, asounding boardsupported therein. the board being perfo rated, a cell attached tothe'sounding board and. covering the perforated portion thereof,consisting of a thin perforated plate substantially parallel with and ashort distance from the face of the sounding board, and a rim unitingthe said plate with the sounding board, and a tubular connection betweenthe casing and the sound box.

8. The combination with the sound box of a sound reproducing machine, ofa casing of rigid resonant material, a sounding board supported therein,the board being perforated. a cell attached to the sounding board andcovering the perforated portion thereof, a tubular connection betweenthe casing and the sound box open at both ends, at one to the atmosphereand at the other into the casing, and a valve controllingthe openingbetween the tubular connection and the casing, the wall of the casingopposite the cell being perforated. p 9. The combination with the soundbox of a sound reproducing machine, of. a casing, a sounding boardsupported therein and having a series of openings therein, a cellattached to the sounding board and covering the perforated portionthereof, and a tubular connection between the casing and the sound box.

10. The combination with the sound box of a reproducing machine, of acasing, a sounding board supported therein and having a series ofopenings therein, a cell attached to the sounding board and covering theperforated portion thereof, the casing having an opening opposite thecell, and a tubular connection between the casing and the sound box.

JOHN D. BARTER.

Witnesses:

JOHN S. BARKER, Geo. B. Prrrs.

